Svg-in-object-placeholder-height-auto.html is crashing/flaky

The test has been crashing sporadically on Linux debug builds.

BUG=392640
TBR=davve@opera.com

Review URL: https://codereview.chromium.org/387703002

git-svn-id: svn://svn.chromium.org/blink/trunk@177884 bbb929c8-8fbe-4397-9dbb-9b2b20218538